Arithmetic Mean Value Research Articles

Investigation of the Relationship between Free Time Management, Social Media Addiction and Life Satisfaction of University Students During the COVID-19 Pandemic Process

The aim of this study is to examine the relationship between university students free time management, social media addiction and life satisfaction during the COVID-19 pandemic.The sample group of the study consists of 114 female and 291 male university students. Free Time Management Scale, Social Media Addiction Scale and Life Satisfaction Scale were used as data collection instruments in the research. SPSS 25 package program was used in the analysis of the data; In their statistical representations, arithmetic mean, standard deviation and frequency values are presented. For analysis to the data set; T-Test for Independent Samples, Multivariate Analysis of Variance (MANOVA), One Way Analysis of Variance (ANOVA) and Pearson Correlation Test were applied.When the T-Test results for Independent Samples are examined; In terms of gender variable, a significant difference was found in favor of women in the “goal setting and method” sub-dimension of the Free Time Management Scale. When the results of Multivariate Analysis of Variance MANOVA test were examined; In terms of daily social media usage times, a significant difference was found in the sub-dimensions of preoccupation, mood regulation, repetition and conflict of the Social Media Addiction Scale.As a result, it is seen that there is a relationship between university student participants’ free time management and social media addiction. However, no relationship was found between life satisfaction and social media addiction. While a low negative correlation was found between the total score of life satisfaction and the free time management programming sub-dimension, no correlation was found between the sub-dimensions of goal determination and method, assessment and free time attitude.

Morphometric variation of Middle-American cichlids: Theraps– Paraneetroplus clade (Actinopterygii: Cichliformes: Cichlidae)

This study assesses the patterns of variation in body shape, and relations of morphological similarity among species of theTheraps–Paraneetroplusclade in order to determine whether body shape may be a trait in phylogenetic relations. A total of 208 specimens belonging to 10 species of theTheraps–Paraneetroplusclade were examined. The left side of each specimen was photographed; in each photograph, 27 fixed landmarks were placed to identify patterns in body shape variation. Images were processed by using geometric morphometrics, followed by a phylogenetic principal component analysis. The phylogenetic signal for body shape was then calculated. To determine the relations in morphological similarity, a dendrogram was created using the unweighted pair group method and arithmetic mean values, while a Procrustes ANOVA and post-hoc test were used to evaluate significant differences between species and habitats. We found three morphological groups that differed in body length and depth, head size, and the position of the mouth and eyes. The body shape analysis recovered the morphotypes of seven species, and statistical differences were demonstrated in eight species. Based on traits associated with cranial morphology,Wajpamheros nourissati(Allgayer, 1989) differed the most among the species examined. No phylogenetic signal was found for body shape; this trait shows independence from ancestral relatedness, indicating that there is little congruence between morphological and genetic interspecific patterns. As evidenced by the consistently convergent morphology of the species in theTheraps–Paraneetroplusclade, the diversification of the group is related to an ecological opportunity for habitat use and the exploitation of food resources. Although no phylogenetic signal was detected for body shape, there appears to be an order associated with cranial morphology-based phylogeny. However, it is important to evaluate the intraspecific morphologic plasticity produced by ecological segregation or partitioning of resources. Therefore, future morphological evolutionary studies should consider cranial structures related to the capture and processing of food.

Petrological and geochemical constraints on the petrogenesis of granitoids in the Gonghe geothermal basin, western Qinling (China)

The Gonghe geothermal basin is situated in the westernmost part of the western Qinling orogen and possesses the supreme potentials to explore and develop hot dry rock (HDR) geothermal resources in China. The basal rock of HDR reservoir in Gonghe basin is composed of granitoids. In this contribution, in order to constrain the formation mechanism of the Gonghe HDR, granitic samples from outcropping have been collected and drilling core samples data from the archives also been compiled. The studied results show that the obtained zircon U–Pb ages of 255.1 ± 1.9 Ma and 253.9 ± 2.6 Ma for granodiorite and monzogranite, respectively. All granitoids from both outcropping and drilling core have the similar rock associations and their major and trace elements possess the consistent evolved patterns, such as relative enrichment of LILEs (e.g., K, Rb), depletion of HFSEs (e.g., Nb, Ti), and negative Eu anomalies (0.32–0.66), indicating that they share the same magma sources and evolutional processes. And they have the affinity of I-type granites. They were derived from the mixture of partial melting of metabasaltic rocks in the lower crust and a small amount of mantle-derived magma and formed in a subduction-related setting relative to the southward subduction of the Zongwulong oceanic crust beneath the west Qinling terrane. The heat production values of rocks around the Gonghe basin were calculated and all basal granitic rocks ranges from 0.35 to 8.51 μW/m3, yielding an arithmetic mean value of 1.97 μW/m3, indicating that the radioactive heat generation capacity of granitoids in the Gonghe basin is slightly lower. The HDR reservoir in the Gonghe basin was probably due to an allied thermal effect of the radiogenic heat production in the thickening continental crust and the heat contributed by a deep magma chamber below the basin. The early Triassic granitoids with a higher thermal conductivity serve as the conductive medium of the geothermal heat; whilst the sedimentary rocks marked by lower thermal conductivity above the granitic batholiths act as the reservoir cap. This contribution provides a relatively rational understanding for the mechanism of the HDR reservoir in Gonghe geothermal basin from the petrological and geochemical perspectives, which is conducive to the geothermal potential assessment and estimation, and to-be implementation of the Enhanced Geothermal System demonstration project in China.

A reliable and straightforward index to avoid nuisance trip of the conventional Z‐based loss‐of‐field relay in synchronous generators

The conventional impedance (Z)-based relay which is the well-known relay to preserve the power plant's synchronous generator (PPSG) against loss of field (LOF) accident may fail during some stable power swing (SPS); on the other hand, most of the previously introduced schemes may fail during the happening of hybrid events. In this paper to overcome the raised problems, a straightforward index is developed for reliable detection of the hybrid events, and it is combined with an AND-logic cluster with the Z-relay to avoid its spurious trip during SPS events. The reactive power (QSG) of the faulty PPSG is continuously decreased during LOF, while it oscillates under both SPS and hybrid events, leading to non-detection of the hybrid event. Hence, using the integral operator and arithmetic mean value are suggested to eliminate the swinging variations of QSG as a Z-relay blocking function (ZRBF). Thus, QSG decreases during both LOF and hybrid events and does not decrease under SPS events. Therefore, by combination of ZRBF with the Z-relay, the PPSG is properly tripped out during the both LOF and hybrid events, and wrong tripping under SPS is reliably hindered. The reliable performance of developed scheme is completely approved thorough performed simulation studies.

Electric Field Parameters of Natural Negative Cloud-to-Ground Lightning in China

This article presents the electric field characteristics of 1612 single, 912 first, and 2901 subsequent return strokes (RS) in negative lightning in Guangdong Province, China. Statistic parameters of electric field waveforms include risetime, fall time, half-peak width, zero-crossing time, overshoot duration, initial peak, overshoot amplitude, and ratio of initial peak to overshoot (Ep/Eos). The results show that the electric field parameters of single RS are similar to those of the first RS. The difference of the geometric mean (GM) for all the parameters is within 10%, except for the Ep/Eos. The value of Ep/Eos for the first strokes is 14.3% larger than that of the single RS. But the values of these parameters for subsequent RS show significant differences from the single and first RS. The values of overshoot duration for subsequent RS are similar to those of the first RS, while the ratio of initial peak to overshoot is larger. As for the other parameters, the arithmetic mean and GM values are all more than 40% larger than the corresponding values of subsequent RS.

Experimental study of the influence of family structure on the development of creativity of children of preschool age


 
 
 The article presents theoretical substantiation and empirical research of the problem of the influence of the family structure on the development of creativity of children of preschool age. The relationship between creativity and family type, number of children in the family, birth order, and intervals between births is analyzed. Peculiarities of influence of family structure (by the number of children) for the development of creativity of children of preschool age are researched. The absence of significant differences in partial (productivity, flexibility, originality) and a general indicator of verbal creativity of children with one child, small and large families has been experimentally established. Research of figurative creativity allowed to identify significant differences in partial indicators of productivity and originality, and the general indicator of figurative creativity: the highest arithmetic mean values are determined in the group of children from small families, and the lowest - in the group of children from large families. In children brought up in single children families, the highest arithmetic mean value is revealed by the partial indicator of the name, and the lowest - in children from large families. In children of preschool age from single, small, and large families no significant differences by partial indicators of the development and resistance to the closure were found. The heterogeneity of verbal and figurative creativity structure is determined in children of preschool age in all types of families. Significant differences were found in the general indicators of creativity: the highest arithmetic mean value was determined in the group of children from small families, and the lowest - in children from large families. Conclusions are made that children from small families are the most creative, and children from large families - the least.
 
 

Population Dynamics of the Village of Chumay in the XIX – Early XX Centuries

The article deals with the population dynamics of the village of Chumay in the XIX – early XX centuries. The main research objective was to study statistical data and identify the causes and conditions that had a decisive impact on the demographic situation in Chumay during the period under review. The study was based on a critical analysis of published and unpublished historical sources. The reliability of the data was checked by comparing the arithmetic mean values. The analysis involved the number of houses and farms, the total number of residents, and their distribution by class, religion, and gender. The resettlement policy of the state and the associated natural growth proved to be the main factor that affected the population of Chumay. The population growth was associated with the permanent placement of exiles in Chumay. Voluntary immigrants from the inner provinces of Russia did not have a significant impact on the local demography. The paper also introduces the average population of the Chumay household in the XIX – early XX centuries.

ТЕМПЫ ПРИРОСТА И ПРОГНОЗИРОВАНИЕ ОБЩЕЙ ЗАБОЛЕВАЕМОСТИ ЖИТЕЛЕЙ СЕЛЬСКИХ РАЙОНОВ

Introduction. It is necessary to forecast the development of population morbidity, based on the processing and analysis of accumulated reliable information to provide timely high-quality medical service, and to develop a set of targeted therapeutic and preventive measures. Aim. The aim of the study was to assess the features of the growth rate and to forecast general morbidity of the adult population in rural areas focused on different branches of agriculture. Material and methods. The processing and analysis of data from annual statistical reports of the Sanitary-Epidemiological Welfare and Public Health Service of Tashkent region on morbidity of adult population (18 years and older) living in Bostanlyk (fruit and vegetable) and Chinaz (cotton growing) districts were performed. Indicators of general morbidity of rural population in dynamics were studied for the period 2007–2018 by classes of diseases according to ICD-10. Comparative analysis of general morbidity was performed for two 5-year periods (2007–2011 and 2014–2018). Statistical analysis was performed using Microsoft Excel 2016 and Statistica 10.0 software packages. Student’s t-test was used to determine the significance of differences in mean values. Differences of arithmetic mean values were considered reliable at p < 0,05. Results and discussion. In the period from 2007 to 2018, the dynamic changes in the general morbidity of ВЕСТНИК СОВРЕМЕННОЙ КЛИНИЧЕСКОЙ МЕДИЦИНЫ 2021 Том 14, вып. 6 39ОРИГИНАЛЬНЫЕ ИССЛЕДОВАНИЯ the adult population in the cotton-growing and, to a greater extent, in the fruit-and-vegetable districts of Tashkent province were characterized by a negative average growth rate (-6,8 vs. -66,5%). As a result of analysis of statistical data for 2014–2018, in comparison with 2007–2011, decrease of general morbidity of population in fruit and vegetable growing district by 39,5%, and on the contrary, in cotton-growing district there was increase by 9,6%. Forecasting indicates a further decrease in the general morbidity of population in rural areas of Tashkent region in the coming years. At the same time, the tendency to further increase of respiratory diseases - in the fruit and vegetable growing district and respiratory, digestive and circulatory diseases – in the cotton-growing district is outlined. Conclusion. The observed decrease in the general morbidity of the rural population, apparently, is associated with the implementation in Uzbekistan of crop diversification policy since 2010, based on reducing the use of pesticides and mineral fertilizers. Significant prevalence of general morbidity of six leading classes of diseases, characteristics of growth rate and medium-term forecast create the need for monitoring and contribute to establishment of a set of measures for prevention, early detection of diseases and pathological conditions, taking into account the contributing risk factors.

Prevalence, intensity and associated risk factors of Schistosoma mansoni infections among schoolchildren around Lake Tana, northwestern Ethiopia.

Schistosomiasis is one of the widely distributed neglected tropical diseases. It is a serious public health problem in sub-Saharan Africa. The disease is highly prevalent and widely distributed in Ethiopia due to suitable environmental factors and human activities. The prevalence and infection intensity varied from locality to locality in the country. This study aimed to assess the prevalence and intensity of S. mansoni infection and associated risk factors among schoolchildren around Lake Tana. A school-based cross-sectional study was conducted among 710 schoolchildren from February to April 2021 in eight selected primary schools around Lake Tana. A questionnaire was used to collect data on socio-demographic information and potential risk factors of S. mansoni infection. After collecting socio-demographic information, students were requested to bring about 2grams of stool specimens for parasitological examination. The collected stool samples were processed using a single Kato-Katz and Ritchie's concentration techniques. The data were analyzed using SPSS software version 23 and factors with a p-value < 0.05 were considered as statistically significant. The overall prevalence of S. mansoni was 34.9% (95% CI: 31.4-38.7) among schoolchildren in the study area. The eggs per gram (EPG) of stool ranged from 24 to 1659 with arithmetic and geometric mean values of 138.1 EPG and 85.1 EPG, respectively. The majority of S. mansoni infections (61.4%) were classified as low infection intensity. Among the different determinant factors being male (AOR = 1.74; 95%CI = 1.233-2.457; P-value = 0.002), bathing habits (AOR = 1.494; 95%CI = 1.013-2.199; P-value = 0.043) and students attending at Qunzela primary school (AOR = 10.545; 95%CI = 3.264-34.067; P-value = 0.001), Alabo primary school (AOR = 3.386; 95%CI = 1.084-10.572; P-value = 0.036) were significantly associated with S. mansoni infection. This study revealed that more than one-third of schoolchildren were infected by S. mansoni in the study area. The majority of the infections were classified as low infection intensity. Being male, bathing habits and schools in which students attended were independent explanatory factors for S. mansoni infection. Therefore, integrated control strategies are needed to improve the health conditions of schoolchildren in the study area.

The five-year dynamics of main indices of functioning of neurosurgical service of the Russian Federation

The neurosurgery is one of the most innovative and hi-tech directions of scientific and clinical activity that significantly contribute into improvement of health and improvement of quality and longevity of human life. This positioning specifies actuality of implementing on regular basis the analysis of trends of its development with purpose to improve corresponding indices of its efficiency, to develop conditions for continuity of medical process, to ensure equal accessibility of specialized neurosurgical medical care to population in the Regions of the Russian Federation. The purpose of the study was to describe and to analyze indices of neurosurgical service functioning to support decision making related to development of professional partnership and ensuring for population of different regions of Russia equal access to profile specialized medical care. The data of 2015-2019 was collected from 85 Subjects of the Russian Federation contained in the forms of state statistical observation "Data on activity of divisions of medical organization providing medical care in hospital conditions" and "Data on medical organization". The analysis of the collected data was implemented using such statistical tools as simple (unweighted) arithmetical mean values, specific weight of indices values, mean-root-square (standard) deviation from average values, coefficient of variation (mean-square distance and average value ratio). The data set considered as homogeneous if coefficient of variation did not exceed 33%. The study revealed that in the Russian Federation, at the mean, provision of beds of neurosurgical profile to population in 2015-2019 decreased from 9.22 to 8.83 beds per 100 000 of population. In 2019, intensity of hospitalization made up to 2.77±1.06 cases per 1000 of population. The average duration of treatment for five years decreased for 1 day and in 2019 made up to 8.47 days (9.96±2.3 days on beds for adults and 7.00±2.1 on beds for children). The mean annual occupancy of one bed of neurosurgical profile for adults decreased from 319.6±31.3 days in 2015 to 311.7±29.8 days in 2019 and for children from 305.4±28.3 days in 2015 to 289.0±29.1 days in 2019. The total hospital lethality of neurosurgical beds in 2019 consisted 1.22±1.19% that is 22.7% less than in 2015 (1.50±1.37%). The number of implemented surgical operations increased from 146.4 in 2015 to 179.1 thousand in 2019, i.e. for 22.4% and made up to 2.7 operations per 1000 of population. The postoperative lethality decreased from 9.63±7.07% in 2016 to 8.19±4.48% in 2019. In 2019, there were 1.91±0.61 neurosurgeons (natural persons) per 100 000 of population. The total number of established posts of neurosurgeons in 2019 made up to 4792.25 units (in 2015 - 4629.75 units) and out of them 4318 units are occupied (in 2015 - 4264 units). The occupied units covered 2923 neurosurgeons as natural persons. On average, per one neurosurgeon (natural person) in the Subjects of the Russian Federation fall 4.7±1.30 beds of neurosurgical profile (from 2.6 to 10.7), 54.7± 24.6 surgical operations on nervous system per year (from 14 to 162), 137.8±41.1 cases of neurosurgical beds hospitalization (from 60 to 300). In five years, the structure of types of surgical operations on nervous system changed insignificantly. The surgeries in case of degenerative diseases of spline prevail and their specific weight increases. In Russia, significant differentiation of the Regions in level of resource support of medical care of neurosurgical profile continue to remain. At that, the Russian neurosurgeons in average implement three times less operation per year than their respective colleagues from Western Europe. In Russia, the main portion of neurosurgical operations is implemented in case of degenerative diseases of spine while in the developed foreign countries in case of cerebral stroke that is one of the main causes of death all around the world. To ensure equal access of population of different Subjects of Russia to profile specialized medical care an integration of clinical and administrative processes (vertical integration) is needed. The important role in solution of this task belongs to National medical research centers organized in Russia on the basis of leading Federal state scientific medical organizations.

Critical Reading Self Efficacy and Information Pollution on the Internet: Preservice Teachers’ Perceptions

The purpose of this research was to examine the critical reading self-efficacy (CRSE) perceptions of prospective teachers and their awareness of information pollution on the internet. A relational survey model was utilized in the research. The study sample, whose universe was prospective teachers studying at Kilis 7 Aralık University, consisted of 296 teacher candidates and was determined using the simple random sampling method. The data were collected through the “Critical Reading Self-Efficacy Perception Scale” and the “Information Pollution on the Internet Scale.” The data analysis was done by calculating the arithmetic mean and standard deviation values, t-test, ANOVA, and Pearson correlation analysis. The results showed that prospective teachers’ self-efficacy perceptions for critical reading are high. The variables of gender and the number of books read in the previous year were not determinative in the perception of critical reading self-efficacy. It was also found that the variables of the department, year of study, and participation in online activities affect perceptions of prospective teachers’ self-efficacy. In addition, their awareness of information pollution on the internet is above the medium level. It was determined that the variables of gender, department, year of study, number of books read in the previous year, and online activities did not have a decisive effect on awareness of information pollution on the internet. The correlation analysis showed that the sum of the scales was not related to each other, but there was a positive relationship in the sub-dimensions. Suggestions for future research and practitioners were provided.

Pollution of mine and ground water in Shakhtinsky district of Eastern Donbass

The main purpose of this research is to assess the role of coal mines in generation of chemical composition of mine and ground water in the oldest coal-bearing Shakhtinsky district in Eastern Donbass. The standard methods of mathematical and statistical data analysis are used to characterize mine and ground water (estimated arithmetical mean, median estimator, minimum and maximum values, standard deviation). The main index of water contamination is the contamination rate of water, soil, bottom sediments, etc., which is commonly used in geochemistry and geoecology, namely, the pollution load factor and the overall water pollution index. The water quality assessment uses the standards adopted in RF, USA, EU and WHO for drinking and fishery water. The practices of coal mining and mine closure widely use leaching, oxidation and dissolution elements, especially sulphur and sulphides, the content of which in coals and rocks reaches 4-5 %. As a result, mine water becomes highly mineralized and often acidic, and has the highest concentrations of Fe and Mn, hundreds of time higher than MAC in drinking water. Furthermore, it should be noted that MAC is largely exceeded by concentrations of Be, Ni, SO4, Mg and Na. Heavily contaminated ground water in coal-bearing Shakhtinsky district sometimes contain acid water with mineralization up to 15 g/l. The studies show that mine water is the main source of ground water pollution. The high contamination rate of mine and ground water in Shakhtinsky coal mining district necessitates monitoring observations toward improvement of water treatment technologies and environmental reclamation. In the development of mine water treatment technologies, it is necessary, first, to reduce the concentrations of Fe and Mn, as well as Be, Ni, SO4, Mg, and the index of mineralization M.

WORKING WITH DATA IN STATISTICAL RESEARCH

Statistical data in most cases are described as an arithmetic mean value and a median depending on themselves, in the absence or presence of extreme values, respectively. Also, when using the classical hypothesis testing, errors of the type I (erroneous rejection of the null hypothesis of the absence of differences) and type II (erroneous acceptance of the null hypothesis) inevitably occur. Sometimes in the data, you can make the wrong choice when choosing the dependent and independent variable. The classical check does not give a complete picture of the data of the general population. Confidence intervals for a range of values for selection within a certain probability (95%). One of the modern methods for assessing the mean, mean and other measures is resampling, in particular, bootstrap (multiple generation of samples).

Structure of the Upper and Lower Surfaces of Human Corpus Callosum

The corpus callosum in the interval between the cerebral hemispheres is a plate of white matter, uneven in thickness, in which two surfaces are distinguished - the upper and lower ones, bent according to its lateral profile. The objective of the study was to study the individual variability of location of the lateral and medial longitudinal strips on the upper surface of the corpus callosum, as well as structural features of its lower surface. The material was the brain of men and women (10 specimens each) of the second period of adulthood, who died for the causes not related to the pathology of the central nervous system. After two weeks of fixation in a 10% formalin solution, the brain was prepared by separating the cerebral hemispheres and other parts of the brain from the corpus callosum, resulting in exposure of its upper and lower surface, which was photographed using a digital camera. As evidenced by the obtained data, the width of the trunk of the corpus callosum in men varies from 9 to 16 mm, whereas in women the difference between the minimum (11.0 mm) and the maximum (20.0 mm) values is greater than in men, when in fact there is only small difference of the arithmetic mean value. Thus, we offer to consider the lateral longitudinal strips to be the boundaries of the corpus callosum hemispherical part and the distance between them determines the width of this formation, which in average is 13.0 ± 2.5 mm in men and 14.4 ± 2.7 mm in women. In the meantime, the nature of the individual variability of the width of the corpus callosum trunk in women is more diverse than in men.

HUMAN URINARY BLADDER GLANDS AND THERE MACRO-MICROSCOPIC PECULIARITIES

Purpose of the investigation is to learn the morphological peculiarities (quantity parameters, age, individual and regional characteristics) of the glands of urinary bladder in the different age stages of the postnatal ontogenesis in the norm. A macro-microscopy method on total preparations of a wall of the bladder 54 received from corpses. Victims from the casual reasons at the age from the period newborn to senile age and we investigated variants of the form of a bladder glands, feature of its change in different sites of a wall of organ (proximal, average, distal thirds), taking into account age. Glands have preliminary been painted 0.05 % by a solution methylene dark blue with Sinelnicov’s method. The glands were investigated with the application of stereomicroscopic-binocular microscope MBS-9. Statistical data processing included calculation of arithmeticmean values, their errors, confidential intervals (excel). In quantity of the parameters of the urinary bladder, glands have individual changeability in the investigation. The boundary of variation of the parameters of the urinary bladder glands is rather wider in the maturity and senile stages. Connected with biological activity of the people in the definite degree, the quantity of the glands does not change in comparison with elderly period in old stage. In the stages of the first maturity and majority, the parameters of the measure and quantity of the urinary bladder glands in the women have difference from men. In this microscopic investigation, there is very important anatomical scientific information about the human urinary bladder glands that in the different stages, their quantity, age, form and regional changeability, proximal-distal gradient as well as other anatomical facts were established.

Information, Media and Technology Skills in terms of Curricula, Process and Product in Middle and High Schools

The aim of this study is to examine how middle and high school curricula and practices support students to acquire information, media and technology skills. In the qualitative dimension of the study which was designed according to the mixed method, document analysis, observation and interview were used. The 23-itemed Information, Media and Technology Skills Competency Scale was used for the quantitative dimension of the study. Content analysis was performed for analysing the curricula, data obtained through observations and interviews. In the analysis of the data obtained from the scale, frequency, percentage, arithmetic mean and standard deviation values were used in the central and prevalence measurements. The results of the curricula analysis show that problem solving and information and data literacy skills were outnumbered in all analysed curricula. The activities carried out in the classroom during the observation and interview process were mostly related to information and media literacy and problem solving. According to the results of the scale; middle and high school students considered themselves to be relatively moderate in their information, media and technology skills. While the highest score of the students was of information and data literacy; programming skills were the weakest dimension.

INFORMATION, MEDIA AND TECHNOLOGY SKILLS OF SPORT SCIENCES STUDENTS

Although there have been initiatives for students to acquire proper 21st century skills in association with technology in Turkey for a long time, research on the information, media and technology skills of sport sciences undergraduates is limited. This study examines the competency levels of sport science undergraduates on information, media and technology skills, and the relationship between their competency levels and certain variables such as gender, departments, grades, personal computer (PC) possession and internet access. In the process of the implementation of the Information, Media and Technology Skills Competency scale, the sample of the study was composed of 298 sport sciences undergraduates. In the analysis of the data obtained from the scale, frequency, percentage, arithmetic mean and standard deviation values were used in the central and prevalence measurements. According to the results of the scale; sport sciences undergraduate students considered themselves to be moderate in their information, media and technology skills. While the highest score of the students was of communication and collaboration; programming skills were emerged as the weakest dimension. It was found that there are significant correlations between their competency levels and certain variables such as grade, PC possession and internet access.

Combining asynchronous microphone array measurements for enhanced acoustic imaging and volumetric source mapping

This paper explores the advantages of combining asynchronous microphone array measurements for acoustic source mapping in two and three–dimensional applications. Four different approaches are considered, three consisting of the combination of the source maps (arithmetic mean, geometric mean, and minimum value), and a fourth one obtained by combining the cross–spectral matrices of all the asynchronous measurements into a larger matrix and applying beamforming with it. Both synthetic and experimental test cases convey enhanced results concerning the single measurement baseline, especially by reducing the spurious sidelobes. Two aeroacoustic experiments are considered, the first features a distributed sound source over a flat plate model tested in a wind tunnel and the second features a hovering drone with multiple sound sources, representing typical challenges for 2D and 3D source localization, respectively. For the 2D source mapping configuration, the sidelobe level was reduced up to 5 dB with respect to the baseline, while maintaining a similar beamwidth of the main lobe. For the 3D test cases, the approaches enable volumetric source mapping capabilities, even when planar microphone arrays are considered, commonly available in typical test facilities. Overall, the minimum value approach presents the best performance for all cases in terms of reduced main lobe beamwidth and sidelobe levels.

Прогнозування неканцерогенного ризику для здоров’я населення від виробництв механічної переробки вторинних полімерів

The most hygienically safe process of recycling polymers is mechanical recycling, which does not cause the destruction of polymers, products of which dangerously affect all components of the environment and man. The purpose of the study is to predict the non-carcinogenic risk to public health from the production of mechanical processing of secondary polymers, depending on the presence or absence of the stage of mechanical activation in the processing process. Materials and methods: sanitary-epidemiological examination; risk assessment of dangerous factors for public health; instrumental assessment methods; statistical processing of results – determination of arithmetic mean values, standard error, quadratic deviation. Results and discussion. It is established that the total indicators of air pollution by polymer dust, nitrogen dioxide and carbon monoxide do not exceed the permissible level of pollution, and the degree of danger of this category of production is assessed as safe. Analysis of the obtained values of hazard coefficients of chemicals for the production of mechanical processing of secondary polymer raw materials without the stage of mechanical activation showed that the risk level for the maximum concentration of polymer dust and nitrogen dioxin at a distance of 25 m is assessed as alarming. The hazard factor for the maximum concentration of carbon monoxide at all distances studied did not exceed the permissible limits. For the production of mechanical processing of secondary polymer raw materials with the stage of mechanical activation, the level of risk for any of the test substances and at all distances studied did not exceed the allowable. Conclusion. Indices of danger of impact on individual organs and systems of the body (respiratory system, central nervous system, cardiovascular system, blood, eyes) of the investigated substances (polymer dust, nitrogen dioxide, carbon monoxide) at a distance of 50 m from the processing of secondary polymer raw materials without stages of mechanical activation are admissible, and for production with a stage of mechanical activation – minimum. It is established that according to the indicators of non-carcinogenic risk, sanitary-protection zone of production facilities for mechanical processing of secondary polymer raw materials without the stage of mechanical activation cannot be less than 50 m, and with the stage of mechanical activation can be reduced to 25 m

Contrasting fates of terrestrial organic carbon pools in marginal sea sediments

Burial of terrestrial organic carbon (OCterr) in marginal sea sediments is a key component of the carbon cycle, exerting long-term influence on atmospheric CO2 and climate. Assessment of the burial efficiency of OCterr is of key importance, yet remains poorly constrained due to current gaps in our knowledge of mechanistic controls, including the influence of organic matter composition and age on the fate of OCterr in marine sediments. We measured bulk characteristics (δ13C and Δ14C of OC; mineral surface area, SA; grain size; n = 98 samples) and biomarker carbon isotopic compositions (fatty acid δ13C and Δ14C; n = 11) of a suite of surface sediment samples from the Bohai Sea and Yellow Sea (BS-YS). Combining with published results, bulk OC (n = 234) and biomarker (n = 19) carbon isotopic data are used to examine spatial variability in the sources and ages of OCterr in this shallow marginal sea system. Biomarker carbon isotopic values are used to constrain endmember values, and a dual carbon isotope mixing model was applied to all bulk samples to develop a spatially explicit assessment of contributions of different pools of OCterr. Although highly spatially variable, pre-aged OC (OCpre-aged) and fossil OC (OCfossil) when combined (i.e., “non-modern OC”) on average accounted for 51 ± 10% of the OC in BS-YS surface sediments. This was equivalent to the proportion of OCterr (ave., 51 ± 14%) estimated from a δ13COC binary mixing model, suggesting OCterr in the mixed layer of BS-YS sediments is predominantly composed of millennial-aged OC. The burial potential of pool-specific OCterr was then evaluated through comparison of corresponding mineral SA-normalized loadings of surface sediments with those of Yellow River suspended particulate matter. Both the regression slope and the arithmetic mean value approaches reveal high burial potential for all terrestrial OC pools delivered by Yellow River, which is attributed to the aged and refractory nature of OC exported from the Yellow River. However, differing relationships of pool-specific OCterr loadings between BS-YS and Yellow River sediments imply contrasting fates. In particular, we find that the burial potential of OCpre-aged is consistently greater than that of OCfossil. This surprising observation suggests either enhanced degradation of OCfossil during lateral transport (possibly as a consequence of different mineral associations and hydrodynamic sorting effects), or additional sources for OCpre-aged, such as from small rivers or aerosol deposition. Overall, OC age, mineralogical composition and hydrological settings contribute to the complex patterns of OC residing in northern China marginal sea surface sediments. This novel molecular-isotopic approach reveals significant spatial variability in proportions, contents and burial potential among terrestrial OC pools, and underlines the importance of considering organic matter age and composition in understanding and constraining the fate of OCterr in marine sedimentary environments.